Question: Let A, B be sets with |A| = m n = |B|, and let a(m, n) count the number of onto functions from A

Let A, B be sets with |A| = m ‰¥ n = |B|, and let a(m, n) count the number of onto functions from A to B. Show that
a(m, 1) = 1
Let A, B be sets with |A| = m ‰¥

when m ‰¥ n > 1.

Il a(m, n) = nm

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